Wednesday, 9 May 2018

HR56 Dornoch, progress

A coal bunker was added in 1910 with a coal-hole in the cab.  

The original bunker of HR56, which was in front of the cab spectacle plate, was sheeted over and a hand rail added to match that on the other side when a rear bunker was added in 1910. The new coal bunker replaced the tool box behind the cab and photographs suggest that at this time the rectangular rear cab windows were remodelled rather smaller and square, similar to those at the front and a mesh screen was added to protect the glazing. In addition a coal-hole was added which I've given an elegant vertical sliding door similar to that seen in Stroudley's later Terriers, which he designed for the LB&SCR

There is a 2" gap between the front saddle tank and the original bunker which is not evident on the other two HR Stroudley tanks, only Dornoch displays this. A fairing, on which the dome is mounted, covers the boiler in front of the cab and partly covers the gap. There is an outer and an inner cab front between which the glazing will be sandwiched. The boiler backhead, which for want of information, takes as its model that of the related Stroudley Terriers, is mounted on the inner sheet and this assembly will be removable.

HR56 showing progress to date, chimney and dome from LGM.

My intention is to complete the sheet metal work first and then add the castings and fine detail. The cab is still joined to the bunker assembly by a structural device which ensures accuracy of construction, this will be removed when the structure is complete, before the cab stanchions are put in place. The buffer beam on these engines was a sandwich of metal plates with a wood filling which I hope to replicate. I intend to experiment with Milliput coloured with weathering pigment, to simulate the wooden part as I find real wood, box in this case, hard to work and rather toy-like in appearance.

The frames of the engine are 27mm wide and are cut short just beyond the front driving wheels. The frames are visible in the gap in the footplate between the smokebox and the buffer beam, so they are modelled full scale (actually 29.5mm) and attached to the footplate behind the buffer beam so they fit over the working frames. The join between the dummy front frames and the working frames will not be visible as the front brakes cover it. The smokebox front plate extends below the buffer beam to the cylinder covers so there's a lot of detail in this area and I intend to maximise its potential...